DomTree: Remove the releaseMemory() method

Summary:
It is fully redundant with reset().

Change-Id: I25850b9f08eace757cf03cbb8780e970aca7f51a

Reviewers: arsenm, RKSimon, mehdi_amini, courbet

Subscribers: wdng, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D83084

include/llvm/Analysis/PostDominators.h

@@ -88,9 +88,7 @@ struct PostDominatorTreeWrapperPass : public FunctionPass {
     AU.setPreservesAll();
   }
 
-  void releaseMemory() override {
-    DT.releaseMemory();
-  }
+  void releaseMemory() override { DT.reset(); }
 
   void print(raw_ostream &OS, const Module*) const override;
 };

include/llvm/IR/Dominators.h

@@ -277,7 +277,7 @@ public:
     AU.setPreservesAll();
   }
 
-  void releaseMemory() override { DT.releaseMemory(); }
+  void releaseMemory() override { DT.reset(); }
 
   void print(raw_ostream &OS, const Module *M = nullptr) const override;
 };

include/llvm/Support/GenericDomTree.h

@@ -325,8 +325,6 @@ protected:
     return false;
   }
 
-  void releaseMemory() { reset(); }
-
   /// getNode - return the (Post)DominatorTree node for the specified basic
   /// block.  This is the same as using operator[] on this class.  The result
   /// may (but is not required to) be null for a forward (backwards)
@@ -760,9 +758,6 @@ public:
     return DomTreeBuilder::Verify(*this, VL);
   }
 
-protected:
-  void addRoot(NodeT *BB) { this->Roots.push_back(BB); }
-
   void reset() {
     DomTreeNodes.clear();
     Roots.clear();
@@ -772,6 +767,9 @@ protected:
     SlowQueries = 0;
   }
 
+protected:
+  void addRoot(NodeT *BB) { this->Roots.push_back(BB); }
+
   // NewBB is split and now it has one successor. Update dominator tree to
   // reflect this change.
   template <class N>